Conical crushing mill



Jan. 24, 1928.

1,656,895 H. ACKERMANN ET AL' CONICAL CRUSHING MILL Filed Feb. 5,- 1927Patented Jan. 24, 1928.

UNITED STATES PATENT OFFICE.

HUGO ACKERMANN, F GODESBERG-ON-THE-BHINE, ANfi WILHELM LANGENHEIH, OF

BONN-ON-THE-RHINE, GERMANY.

CONICAL causnnve MILL.

Application filed February 5, 1927, Serial No. 168,229, and in GermanyAugust 6, 1925.

The present invention relates to crushing elements for conical crushingmills.

It is known in conical crushing machines to make the crushing cone,fastened on the shaft, of two concentric portions namely, a seatingelement rigidly keyed on to the shaft and having cylindrical seatingsurfaces graduated outwardly in steps, and a single integral crushingmantle stepped internally corresponding to the fixed element and toconnect these two parts by means of wedges or keys. It is also known toprovide the seating element externally with a surface in the form of atruncated cone tapering towards the top, and to fasten the crushingmantle, correspondingly shaped internally, on the seating element, whichit surrounds with free play, by casting into the free space hard lead(lead-antimony alloy) or the like.

Considerable difliculties occur however, in

' these known constructions of the crushing cone in obtaining a pemanently secure connection during the action between the seating elementand the crushing mantle fastened thereon, as the particularly highcrushing pressure set up at the lower end of the crushing cone where thegreatest disintegration of the material occurs, causes.

a very great tendency to a loosening in a radial direction. Thisloosening leads, when the machine is held in action to damage of thecrushing cone and the seating element, and also lowers the efliciency ofthe crushing machine, so that parts must be renewed prematurely. o

The invention relates to a. crushing cone the mantle of which is mountedon a ste ped seating element or a stepped axle, i no seating element isused, and in which the after the intermediate space between the mantleand the seating element has been filled up by the filling mass such ashard lead. Preferably the lowest steps only are under-cut.

The under-cutting of the portions of the steps is preferably effected bygiving them a conical shape the cone of which runs in the oppositedirection to the external cone of the crushing mantle.

If a crushing cone constructed according to the invention becomesloosened by stresses set up during operation, a small axial displacementof the crushing mantle in upward direction is sufficient to fix it againonto the under-cut seating surfaces.

This small axial displacement of the crushing mantle may be efiected byan adjusting mechanism of suitable type, for example by screws.

Setting screws in cylindrically bored crushing cones are known which putthe latter against a fixed flange and interchangeable intermediateelements, and render possible an adjustment of the crushing cone in avertical direction. Loosening of the crushing cone on its seating facein a radial di rection cannot however be avoided by this 'means.

One form of construction of the improvement is shown in the drawings: a

Figure 1 is a partial elevation of a conical crushing machine invertical section along the dotted line CD in Figure 2.

Figure 2 is a section of the crushing cone in the direction A-B, theouter parts of the crushing machine being omitted.

The stepped seating element 2 is fastened on the shaft 1 by means ofkeys 9, and is enclosed by the crushing mantle 3 with a certain amountof free space. the intermediate free space 4 left being filled up withcast hard lead such as lead-antimony alloy.

A number of grooves 5 preferably four in number, in one of which engagesthe projection 6 of the crushing mantle 3 in order to prevent the samerotating on the seating element 2, are provided in the latter.

In the shown form of construction only the two lower steps 8 of theseating element 2 are under-cut. This construction has particularadvantages. The greatest strain on the crushing mantle occurs at itslowest art. Consequently essentially in this art 0 the mantle an exanding or spreadlng of the material and t us a loosening between mantleand seating element occurs. If therefore, the upper steps of the seatingare cylindrically shaped as shown in the example illustrated, an axialdisplacement of the crushing mantle 3 on the seating element 2 in orderto overcome the loosening in the lower parts of th 1 mantle is possible,if the upper parts of the mantle are not expanded owlng to the slighterstrains executed thereon by the crushed material.

A similar eifect is obtained if only the lowest step ofthe seatingelement is under-cut.

The angle of under-cut relative to. the axis of the seating element issufficiently small whereby the upper edges of the undercut steps projectonly so far that the crushing mantle placed in position as a singleunitary element is prevented from being stripped off by the cooperationof the undercut steps and the mass of filling material.

Adjusting screws 7 are arranged on the lower end of the seating, element2 which press on the crushing mantle 3 from below and force it firmlyagainst the under-cut step faces of the seating element.

The undercut lower steps and also the re maining cylindrical steps maybe provided directly on the shaft itself by suitably stren hening thesame. The special seatin e ement is then dispensed with.

e declare that what we claim is:

1. A conical crushing mill including a conical crushing mantle, a shaftand a seating element fixed to the shaft, a mass of hard lead or thelike material filling u the intermediate space between the crushingmantle and the seating element, steps on the seating element, one ormore of the steps of the seating element being under-cut.

2. A conical crushing mill including a conical crushing mantle, ashaftand a seatin element fixed to the shaft, a mass of bar lead or the likematerial'filling up the intermediate space between the crushing mantleand the seating element, steps on the seating element, one or more ofthe steps of the seating element being undercut so that these have aconical shape oppositely inclined to the outer cone of the crushingmantle.

3. A conical crushing mill including a conical crushing mantle, a shaftand a seating element fixed to the shaft, a mass of hard lead or thelike material filling up the intermediate space between the crushingmantle and the seating element, steps on the seating element, only thelowest step or steps of the seating element being under-cut.

4, A conical crushing mill including a comcal crushing mantle, a shaftand a seating element fixed to the shaft, a mass of hard lead or thelike material filling up the intermediate space between the crushingmantle and the seating element, steps on the seating element, one ormore of the steps of the seating element being under-cut, whereby theangle of undercut is so small that whilst a locking effect is obtainedby a relatively small axial displacement of the crushing mantleagainst.the stepped seating element stripping the mantle onto the seatinelement from the top of the same is possible.

5. A conical crushing mill including a stepped seating element and ashaft forming a unitar body therewith, a crushing mantle surroun ingsaid stepped seating element, a mass of hard lead or the like substancefilling up the space between the stepped seating element and thecrushing mantle, under-cut surfaces on the stepped seating element andadjusting devices provided on the seating element or on the shaft, bywhich the crushing mantle when loosened is brought again into a positionwhere it is firmly fastened by transmission of the filling mass to theunder-cut steps.

6. A conical crushing mill including a stepped seating element and ashaft forming a unitary structure therewith, a crushing mantlesurrounding said stepped seating element, a mass of hard lead or thelike substance fillin up the space between the stepped seating elementand the crushing mantle, under-cut surfaces on the stepped seatingelement, set-screws arranged in the lower end of the seating element orbelow the mantle on the shaft and pressing on the crushing mantle frombelow, by which the crushing mantle when loosened, is brou ht back intoa position where it is firmly astened by transmission of the fillingmass to the under-cut steps.

7. A conical crushing mill including a shaft, a stepped seating elementrigidly mounted on the shaft by key or the like means, a crushingmantle, a mass of lead or the like material adapted to fill up the s acebetween the stepped seating element an the crushing mantle, the steps onthe seating element being under-cut to form aconical shape running inthe opposite direction to the outer conical shape of the crushingmantle.

8. A conical crushing mill including a shaft, a stepped seating elementfixed. to the shaft, a crushing mantle surrounding said seating element,a mass of material such as lead for filling up the intermediate spacebetween the crushlng mantle and the seating element, under-cut steps onthe seating element, means for displacing axially the crushing mantleagainst the seating element to provide rigid locking, between this andthe crushing mantle.

9.,A conical crushing mill including a shaft, a seating element shapedof one body with the shaft, a crushing mantle surrounding said seatingelement, a mass of material such as lead for filling up the intermediatespace between the crushing mantle and the seating element, under-cutsteps on the seating element, means for displaclng axially the crushingmantle against the seating element the crushing mantle.

In witness whereof, we have hereunto sgg2nzed our names this 18th day ofJanuary, 1

DR. ING. HUGO AGKERMANN. WTLHELM LANGENHEM.

to provide rigid locking between this and I

